linux/drivers/ata/pata_cs5536.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * pata_cs5536.c	- CS5536 PATA for new ATA layer
 *			  (C) 2007 Martin K. Petersen <[email protected]>
 *			  (C) 2011 Bartlomiej Zolnierkiewicz
 *
 * Documentation:
 *	Available from AMD web site.
 *
 * The IDE timing registers for the CS5536 live in the Geode Machine
 * Specific Register file and not PCI config space.  Most BIOSes
 * virtualize the PCI registers so the chip looks like a standard IDE
 * controller.	Unfortunately not all implementations get this right.
 * In particular some have problems with unaligned accesses to the
 * virtualized PCI registers.  This driver always does full dword
 * writes to work around the issue.  Also, in case of a bad BIOS this
 * driver can be loaded with the "msr=1" parameter which forces using
 * the Machine Specific Registers to configure the device.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/libata.h>
#include <scsi/scsi_host.h>
#include <linux/dmi.h>

#ifdef CONFIG_X86_32
#include <asm/msr.h>
static int use_msr;
module_param_named(msr, use_msr, int, 0644);
MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
#else
#undef rdmsr	/* avoid accidental MSR usage on, e.g. x86-64 */
#undef wrmsr
#define rdmsr(x, y, z) …
#define wrmsr(x, y, z) …
#define use_msr …
#endif

#define DRV_NAME …
#define DRV_VERSION …

enum { … };

/* Some Bachmann OT200 devices have a non working UDMA support due a
 * missing resistor.
 */
static const struct dmi_system_id udma_quirk_dmi_table[] = …;

static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
{ … }

static int cs5536_write(struct pci_dev *pdev, int reg, int val)
{ … }

static void cs5536_program_dtc(struct ata_device *adev, u8 tim)
{ … }

/**
 *	cs5536_cable_detect	-	detect cable type
 *	@ap: Port to detect on
 *
 *	Perform cable detection for ATA66 capable cable.
 *
 *	Returns a cable type.
 */

static int cs5536_cable_detect(struct ata_port *ap)
{ … }

/**
 *	cs5536_set_piomode		-	PIO setup
 *	@ap: ATA interface
 *	@adev: device on the interface
 */

static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
{ … }

/**
 *	cs5536_set_dmamode		-	DMA timing setup
 *	@ap: ATA interface
 *	@adev: Device being configured
 *
 */

static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{ … }

static const struct scsi_host_template cs5536_sht = …;

static struct ata_port_operations cs5536_port_ops = …;

/**
 *	cs5536_init_one
 *	@dev: PCI device
 *	@id: Entry in match table
 *
 */

static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{ … }

static const struct pci_device_id cs5536[] = …;

static struct pci_driver cs5536_pci_driver = …;

module_pci_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_DEVICE_TABLE(pci, cs5536);
MODULE_VERSION(…);